Leases Rent Expense Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Operating Leased Assets [Line Items]
Minimum rent on real property	$ 68,329	$ 59,076	$ 53,085
Contingent rent on real property	7,619	5,738	5,011
Restaurant rent expense	75,948	64,814	58,096
Administrative and equipment rent	76,276	65,081	58,372
Rent expense on operating leases	76,276	65,081	58,372
General and Administrative Expense [Member]
Operating Leased Assets [Line Items]
Administrative and equipment rent	328	267	276
Rent expense on operating leases	$ 328	$ 267	$ 276